Python library interface to EcoPlug wifi outlet.

Until proper documentation...

Allow UDP 8900 inbound in firewall

>>> from pyecoplug import *
>>> plugs = {}
>>> def add(s):
...     plugs[s.name] = s
... 
>>> def remove(s):
...     del(plugs[s.name])
... 
>>> e = EcoDiscovery(add, remove)
>>> e.start()
>>> plugs
{'test': ('## EcoPlug ##', b'test')}
>>> plugs['test'].is_on()
False
>>> plugs['test'].turn_on()
>>> plugs['test'].is_on()
True
>>> plugs['test'].turn_off()
>>> plugs['test'].is_on()
False
>>> plugs['test'].turn_on()
>>> plugs['test'].turn_off()
>>> e.stop()